// 导出页面为PDF格式
import html2Canvas from 'html2canvas';
import JsPDF from 'jspdf';
export const getPdf = async (dom: HTMLElement) => {
    const canvas = await html2Canvas(dom, {
        allowTaint: true, // 允许跨域
        scale: 4
    });
    if (canvas) {
        // pdf
        const contentWidth = canvas.width;
        const contentHeight = canvas.height;
        const pageHeight = contentWidth / 592.28 * 841.89;
        let leftHeight = contentHeight;
        let position = 0;
        const imgWidth = 595.28;
        const imgHeight = 592.28 / contentWidth * contentHeight;
        const pageData = canvas.toDataURL('image/jpeg', 1.0); // 转为base64
        const PDF = new JsPDF('p', 'pt', 'a4');
        // 分页
        if (leftHeight < pageHeight) {
            PDF.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight);
        } else {
            while (leftHeight > 0) {
                PDF.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight);
                leftHeight -= pageHeight;
                position -= 841.89;
                if (leftHeight > 0) {
                    PDF.addPage();
                }
            }
        }
        // PDF.save('xxxx.pdf'); // 下载pdf
        const pdfData = PDF.output('datauristring');//获取Pdf的base64
        return pdfData;
    }
};